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1. BIOCHEMISTRY NARJISH FATMA
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2. Methionine Metabolism

3. Sulphur amino acids The sulphur containing amino acids are methionine, cysteine and cystine . Among these only methionine is essential. Cysteine can spare the requirement of methionine in the diet. Cysteine and cystine are interconvertible . The sulphur containing amino acids are exclusive dietary source of sulphur to the body.

4. Metabolism of Methionine Methionine metabolism can be divided into three part Utilization of methionine for transmethylation reaction. Conversion of methionine to cysteine and cystine . Degradation of cysteine and its conversion to specialized products.